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