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