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