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