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