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