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