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