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