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)(15,19)(16,18)(17,20)(21,22)(23,29)(24,33)(25,34)(26,27)(28,32)(30,31)(35,36) involution — undirected(5,6)(7,10)(8,9)(11,12)(13,15,18,17)(14,19,16,20)(22,27)(25,33)(28,29)(31,35)(6,9)(10,11)(14,16)(19,20)(21,23,26,32)(22,28,27,29)(24,30,34,36)(25,31,33,35)(1,2,3,4)(5,6)(7,10)(8,9)(11,12)(13,16,18,14)(15,20,17,19)(21,24)(22,25)(23,30)(26,34)(27,33)(28,31)(29,35)(32,36)(5,7,8,12)(6,10,9,11)(13,17,18,15)(14,20,16,19)(21,25)(22,24)(23,31)(26,33)(27,34)(28,30)(29,36)(32,35)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.