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