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