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