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