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