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