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