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