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