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