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