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