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