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