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