One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,11)(4,14)(5,10)(6,7)(8,12)(9,15)(13,16)(17,18)(19,24)(20,26)(21,22)(23,25)(27,29)(28,31)(30,32) involution — undirected(2,7)(3,12)(9,14)(10,13)(17,19,23,22)(18,24,25,21)(20,28,30,27)(26,31,32,29)(33,34)(35,40)(36,41)(37,42)(38,39)(43,47)(44,45)(46,48)(2,7)(5,16)(8,11)(9,14)(18,25)(19,22)(26,32)(27,28)(34,39)(37,47)(40,45)(41,48) involution — undirected(1,3,6,12)(2,8,7,11)(4,10,15,13)(5,14,16,9)(17,20,23,30)(18,26,25,32)(19,27,22,28)(21,31,24,29)(33,35)(34,40)(36,42)(37,41)(38,44)(39,45)(43,46)(47,48)(1,4,6,15)(2,9,7,14)(3,13,12,10)(5,8,16,11)(17,21)(18,19)(20,29)(22,25)(23,24)(26,28)(27,32)(30,31)(33,36)(34,41)(35,43)(37,45)(38,46)(39,48)(40,47)(42,44)(1,5,6,16)(2,10,7,13)(3,14,12,9)(4,8,15,11)(17,22,23,19)(18,21,25,24)(20,28,30,27)(26,31,32,29)(33,37,38,47)(34,42,39,43)(35,41,44,48)(36,45,46,40)A 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.