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