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