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