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