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)(22,26)(24,31)(27,33)(29,32)(14,18)(19,20)(21,22,25,26)(23,27,30,33)(24,28,31,34)(29,35,32,36)(5,6)(7,10)(8,9)(11,12)(13,14)(15,19)(16,20)(17,18)(21,22)(23,27)(24,28)(25,26)(29,35)(30,33)(31,34)(32,36) involution — undirected(1,2)(3,4)(5,6)(7,10)(8,9)(11,12)(13,15,17,16)(14,19,18,20)(21,23,25,30)(22,27,26,33)(24,32,31,29)(28,36,34,35)(5,7,8,11)(6,10,9,12)(13,16,17,15)(14,20,18,19)(21,24)(22,28)(23,29)(25,31)(26,34)(27,35)(30,32)(33,36)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.