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