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