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