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