One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,7)(5,8)(9,10)(11,13)(12,14)(15,16)(19,25)(23,30)(26,28)(31,32)(35,42)(37,45)(39,40)(41,44) involution — undirected(1,2,5,8)(3,6,9,10)(4,7,12,14)(11,13,15,16)(17,18)(19,23)(20,27)(21,22)(24,29)(25,30)(26,32)(28,31)(33,34,38,36)(35,40,42,39)(37,41,45,44)(43,48,46,47)(3,9)(4,12)(6,10)(7,14)(18,22)(19,25)(24,27)(26,28)(33,35,38,42)(34,39,36,40)(37,46,45,43)(41,48,44,47)(1,3)(2,6)(4,11)(5,9)(7,13)(8,10)(12,15)(14,16)(17,19)(18,23)(20,28)(21,25)(22,30)(24,32)(26,29)(27,31)(33,35)(34,40)(36,39)(37,43)(38,42)(41,48)(44,47)(45,46) involution — undirected(1,2)(3,10)(4,7)(5,8)(6,9)(11,16)(12,14)(13,15)(17,20,21,29)(18,24,22,27)(19,26,25,28)(23,31,30,32)(33,36,38,34)(35,40,42,39)(37,44,45,41)(43,48,46,47)(1,4,5,12)(2,7,8,14)(3,11,9,15)(6,13,10,16)(17,18)(19,23)(20,24)(21,22)(25,30)(26,31)(27,29)(28,32)(33,37)(34,41)(35,43)(36,44)(38,45)(39,47)(40,48)(42,46)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.