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