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