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