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