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