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