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)(11,13)(12,14)(15,16)(17,18)(19,28)(20,25)(21,35)(22,27)(23,31)(24,33)(26,29)(30,42)(32,43)(34,39)(36,48)(37,47)(38,44)(40,45)(41,46) involution — undirected(2,5)(6,7)(9,11)(10,13)(12,15)(14,16)(17,19,29,44,22,32,21,31)(18,23,35,43,27,38,26,28)(20,30,45,48,33,46,34,47)(24,36,40,42,25,37,39,41)(1,3,4,8)(2,6,5,7)(11,15)(13,16)(17,20)(18,24)(19,30)(21,34)(22,33)(23,36)(25,27)(26,39)(28,41)(29,45)(31,47)(32,46)(35,40)(37,38)(42,43)(44,48)(11,15)(13,16)(17,20)(18,25)(19,30)(21,34)(22,33)(23,37)(24,27)(26,40)(28,42)(29,45)(31,47)(32,46)(35,39)(36,38)(41,43)(44,48) involution — undirected(10,14)(13,16)(20,33)(24,25)(30,46)(34,45)(36,37)(39,40)(41,42)(47,48) involution — undirectedA 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.