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