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