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