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