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