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