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