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