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