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