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