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