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