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