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