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)(23,29)(24,32)(26,34)(28,35)(30,36)(31,33) involution — undirected(1,2)(3,4)(5,7,9,15)(6,10,11,13)(8,16,17,14)(12,20,19,18)(21,22,25,27)(23,30,31,26)(24,28,32,35)(29,36,33,34)(2,4)(21,23,25,31)(22,26,27,30)(24,33,32,29)(28,36,35,34)(6,11)(10,13)(12,19)(18,20)(21,22)(23,26)(24,28)(25,27)(29,34)(30,31)(32,35)(33,36) involution — undirected(2,4)(5,8,9,17)(6,12,11,19)(7,14,15,16)(10,18,13,20)(22,27)(23,31)(28,35)(29,33)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.