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