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