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