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