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