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