One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,5)(6,14)(7,9)(10,15)(11,13)(12,16)(19,25)(23,30)(26,28)(31,32)(34,39)(35,37)(41,44)(43,45) involution — undirected(1,3,7,4)(2,8,9,5)(6,11,15,12)(10,16,14,13)(17,18)(19,23)(20,27)(21,22)(24,29)(25,30)(26,32)(28,31)(33,34,38,39)(35,40,37,42)(36,44,46,41)(43,48,45,47)(2,9)(3,4)(6,15)(13,16)(18,22)(19,25)(24,27)(26,28)(33,34)(35,40)(36,41)(37,42)(38,39)(43,47)(44,46)(45,48) involution — undirected(1,4,7,3)(2,8,9,5)(6,12,15,11)(10,16,14,13)(17,19)(18,23)(20,28)(21,25)(22,30)(24,32)(26,29)(27,31)(33,35,38,37)(34,40,39,42)(36,43,46,45)(41,47,44,48)(1,5,7,8)(2,4,9,3)(6,13,15,16)(10,12,14,11)(17,20,21,29)(18,24,22,27)(19,26,25,28)(23,31,30,32)(33,36)(34,41)(35,43)(37,45)(38,46)(39,44)(40,47)(42,48)(1,6)(2,10)(3,11)(4,12)(5,13)(7,15)(8,16)(9,14)(17,18)(19,23)(20,24)(21,22)(25,30)(26,31)(27,29)(28,32)(33,37,38,35)(34,42,39,40)(36,45,46,43)(41,48,44,47)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.