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