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