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