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