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