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