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