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