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