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