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