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