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