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