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)(13,14,17,20)(15,16,19,18)(21,22,25,27)(23,24,28,26)(6,7)(10,11)(13,15)(14,18)(16,20)(17,19)(21,23,25,28)(22,26,27,24)(8,12)(10,11)(15,19)(16,18)(22,27)(23,28) involution — undirected(1,2)(3,4)(5,7,9,6)(8,10,12,11)(13,14)(15,16)(17,20)(18,19)(21,24)(22,23)(25,26)(27,28)(5,8)(6,10)(7,11)(9,12)(13,16)(14,19)(15,20)(17,18)(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.