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