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)(21,22,27,28)(23,31,35,29)(24,26,30,25)(32,34,33,36)(5,7)(6,11)(8,15)(9,16)(10,17)(12,19)(13,14)(18,20)(21,23)(22,29)(24,34)(25,33)(26,32)(27,35)(28,31)(30,36) involution — undirected(1,2,3,4)(5,8,10,9)(6,12,13,18)(7,15,17,16)(11,19,14,20)(21,24)(22,26)(23,32)(25,28)(27,30)(29,36)(31,34)(33,35)(5,9,10,8)(6,12,13,18)(7,16,17,15)(11,19,14,20)(21,25)(22,30)(23,33)(24,28)(26,27)(29,36)(31,34)(32,35)(7,17)(11,14)(15,16)(19,20)(21,26,27,25)(22,30,28,24)(23,34,35,36)(29,32,31,33)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.