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