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