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