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