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