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