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