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