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