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