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