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