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)(23,32)(24,31)(25,29)(26,30)(27,34)(28,35)(33,36) involution — undirected(5,7)(6,11)(8,15)(9,18)(10,16)(12,19)(13,14)(17,20)(21,22,26,30)(23,25,34,36)(24,28,35,31)(27,29,32,33)(1,2,3,4)(21,23,24,33,26,34,35,29)(22,27,31,25,30,32,28,36)(5,8,10,9)(6,12,13,17)(7,15,16,18)(11,19,14,20)(21,24,26,35)(22,28,30,31)(23,33,34,29)(25,27,36,32)(5,9,10,8)(6,12,13,17)(7,15,16,18)(11,20,14,19)(21,25,24,32,26,36,35,27)(22,29,31,23,30,33,28,34)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.