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